I think my birthday will be forgotten again. How should I cheer myself up?

Last year, my parents and my brother forgot my birthday. My mom remembered at the last minute (after getting mad at me on the phone she called back, saying how she didn''t realize it was my birthday) and bought some of my favorite food. But because she and my dad weren't speaking to eachother (my dad's drinking), the two of us just sat in the kitchen quietly eating the food, and when I went to ask my dad (in the other room) if he wanted to join us, he refused. Now the thing is that I thought I was fine with it, but they are having another one of their humungous fights and I think this year is gonna be just as crappy and depressing as the last. What do you think I should do? How can I cheer myself up if it does happen again (which I am sure it will)?